Highly Efficient Adsorption of Heavy Metals and Cationic Dyes by Smart Functionalized Sodium Alginate Hydrogels

Gels

Tianzhu Shi¹  Xinliang Mo¹  Yulong Feng¹  Dandan Song¹  Tao Peng¹  Zhengfeng Xie² 

[1] Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China;Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China;

关键词: sodium alginate;    modification;    heavy metals;    dye;    adsorption;   

DOI  :  10.3390/gels8060343

来源: DOAJ

【 摘 要 】

In this paper, functionalized sodium alginate hydrogel (FSAH) was prepared to efficiently adsorb heavy metals and dyes. Hydrazide-functionalized sodium alginate (SA) prepared hydrazone groups to selectively capture heavy metals (Pb²⁺, Cd²⁺, and Cu²⁺), and another functional group (dopamine grafting), serves as sites for adsorption methylene blue (MB), malachite green (MG), crystal violet (CV). Thermodynamic parameters of adsorption indicated that the adsorption process is endothermic and spontaneous. The heavy metals adsorption by FSAH was physical adsorption mainly due to ΔH^θ < 40 kJ/mol, and the adsorption of cationic dyes fitted with the Langmuir models, which indicated that the monolayer adsorption is dominated by hydrogen bonds, electrostatic interactions, and π-π interactions. Moreover, the adsorption efficiency maintained above 70% after five adsorption-desorption cycles. To sum up, FSAH has great application prospect.

【 授权许可】

Unknown